1 /******************************************************************************
2 *
3 * Module Name: exconvrt - Object conversion routines
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2008, Intel Corp.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
29 *
30 * NO WARRANTY
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
42 */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acinterp.h"
47 #include "amlcode.h"
48
49 #define _COMPONENT ACPI_EXECUTER
50 ACPI_MODULE_NAME("exconvrt")
51
52 /* Local prototypes */
53 static u32
54 acpi_ex_convert_to_ascii(acpi_integer integer,
55 u16 base, u8 * string, u8 max_length);
56
57 /*******************************************************************************
58 *
59 * FUNCTION: acpi_ex_convert_to_integer
60 *
61 * PARAMETERS: obj_desc - Object to be converted. Must be an
62 * Integer, Buffer, or String
63 * result_desc - Where the new Integer object is returned
64 * Flags - Used for string conversion
65 *
66 * RETURN: Status
67 *
68 * DESCRIPTION: Convert an ACPI Object to an integer.
69 *
70 ******************************************************************************/
71
72 acpi_status
acpi_ex_convert_to_integer(union acpi_operand_object * obj_desc,union acpi_operand_object ** result_desc,u32 flags)73 acpi_ex_convert_to_integer(union acpi_operand_object *obj_desc,
74 union acpi_operand_object **result_desc, u32 flags)
75 {
76 union acpi_operand_object *return_desc;
77 u8 *pointer;
78 acpi_integer result;
79 u32 i;
80 u32 count;
81 acpi_status status;
82
83 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_integer, obj_desc);
84
85 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
86 case ACPI_TYPE_INTEGER:
87
88 /* No conversion necessary */
89
90 *result_desc = obj_desc;
91 return_ACPI_STATUS(AE_OK);
92
93 case ACPI_TYPE_BUFFER:
94 case ACPI_TYPE_STRING:
95
96 /* Note: Takes advantage of common buffer/string fields */
97
98 pointer = obj_desc->buffer.pointer;
99 count = obj_desc->buffer.length;
100 break;
101
102 default:
103 return_ACPI_STATUS(AE_TYPE);
104 }
105
106 /*
107 * Convert the buffer/string to an integer. Note that both buffers and
108 * strings are treated as raw data - we don't convert ascii to hex for
109 * strings.
110 *
111 * There are two terminating conditions for the loop:
112 * 1) The size of an integer has been reached, or
113 * 2) The end of the buffer or string has been reached
114 */
115 result = 0;
116
117 /* String conversion is different than Buffer conversion */
118
119 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
120 case ACPI_TYPE_STRING:
121
122 /*
123 * Convert string to an integer - for most cases, the string must be
124 * hexadecimal as per the ACPI specification. The only exception (as
125 * of ACPI 3.0) is that the to_integer() operator allows both decimal
126 * and hexadecimal strings (hex prefixed with "0x").
127 */
128 status = acpi_ut_strtoul64((char *)pointer, flags, &result);
129 if (ACPI_FAILURE(status)) {
130 return_ACPI_STATUS(status);
131 }
132 break;
133
134 case ACPI_TYPE_BUFFER:
135
136 /* Check for zero-length buffer */
137
138 if (!count) {
139 return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
140 }
141
142 /* Transfer no more than an integer's worth of data */
143
144 if (count > acpi_gbl_integer_byte_width) {
145 count = acpi_gbl_integer_byte_width;
146 }
147
148 /*
149 * Convert buffer to an integer - we simply grab enough raw data
150 * from the buffer to fill an integer
151 */
152 for (i = 0; i < count; i++) {
153 /*
154 * Get next byte and shift it into the Result.
155 * Little endian is used, meaning that the first byte of the buffer
156 * is the LSB of the integer
157 */
158 result |= (((acpi_integer) pointer[i]) << (i * 8));
159 }
160 break;
161
162 default:
163
164 /* No other types can get here */
165 break;
166 }
167
168 /* Create a new integer */
169
170 return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
171 if (!return_desc) {
172 return_ACPI_STATUS(AE_NO_MEMORY);
173 }
174
175 ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
176 ACPI_FORMAT_UINT64(result)));
177
178 /* Save the Result */
179
180 return_desc->integer.value = result;
181 acpi_ex_truncate_for32bit_table(return_desc);
182 *result_desc = return_desc;
183 return_ACPI_STATUS(AE_OK);
184 }
185
186 /*******************************************************************************
187 *
188 * FUNCTION: acpi_ex_convert_to_buffer
189 *
190 * PARAMETERS: obj_desc - Object to be converted. Must be an
191 * Integer, Buffer, or String
192 * result_desc - Where the new buffer object is returned
193 *
194 * RETURN: Status
195 *
196 * DESCRIPTION: Convert an ACPI Object to a Buffer
197 *
198 ******************************************************************************/
199
200 acpi_status
acpi_ex_convert_to_buffer(union acpi_operand_object * obj_desc,union acpi_operand_object ** result_desc)201 acpi_ex_convert_to_buffer(union acpi_operand_object *obj_desc,
202 union acpi_operand_object **result_desc)
203 {
204 union acpi_operand_object *return_desc;
205 u8 *new_buf;
206
207 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_buffer, obj_desc);
208
209 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
210 case ACPI_TYPE_BUFFER:
211
212 /* No conversion necessary */
213
214 *result_desc = obj_desc;
215 return_ACPI_STATUS(AE_OK);
216
217 case ACPI_TYPE_INTEGER:
218
219 /*
220 * Create a new Buffer object.
221 * Need enough space for one integer
222 */
223 return_desc =
224 acpi_ut_create_buffer_object(acpi_gbl_integer_byte_width);
225 if (!return_desc) {
226 return_ACPI_STATUS(AE_NO_MEMORY);
227 }
228
229 /* Copy the integer to the buffer, LSB first */
230
231 new_buf = return_desc->buffer.pointer;
232 ACPI_MEMCPY(new_buf,
233 &obj_desc->integer.value,
234 acpi_gbl_integer_byte_width);
235 break;
236
237 case ACPI_TYPE_STRING:
238
239 /*
240 * Create a new Buffer object
241 * Size will be the string length
242 *
243 * NOTE: Add one to the string length to include the null terminator.
244 * The ACPI spec is unclear on this subject, but there is existing
245 * ASL/AML code that depends on the null being transferred to the new
246 * buffer.
247 */
248 return_desc = acpi_ut_create_buffer_object((acpi_size)
249 obj_desc->string.
250 length + 1);
251 if (!return_desc) {
252 return_ACPI_STATUS(AE_NO_MEMORY);
253 }
254
255 /* Copy the string to the buffer */
256
257 new_buf = return_desc->buffer.pointer;
258 ACPI_STRNCPY((char *)new_buf, (char *)obj_desc->string.pointer,
259 obj_desc->string.length);
260 break;
261
262 default:
263 return_ACPI_STATUS(AE_TYPE);
264 }
265
266 /* Mark buffer initialized */
267
268 return_desc->common.flags |= AOPOBJ_DATA_VALID;
269 *result_desc = return_desc;
270 return_ACPI_STATUS(AE_OK);
271 }
272
273 /*******************************************************************************
274 *
275 * FUNCTION: acpi_ex_convert_to_ascii
276 *
277 * PARAMETERS: Integer - Value to be converted
278 * Base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX
279 * String - Where the string is returned
280 * data_width - Size of data item to be converted, in bytes
281 *
282 * RETURN: Actual string length
283 *
284 * DESCRIPTION: Convert an ACPI Integer to a hex or decimal string
285 *
286 ******************************************************************************/
287
288 static u32
acpi_ex_convert_to_ascii(acpi_integer integer,u16 base,u8 * string,u8 data_width)289 acpi_ex_convert_to_ascii(acpi_integer integer,
290 u16 base, u8 * string, u8 data_width)
291 {
292 acpi_integer digit;
293 u32 i;
294 u32 j;
295 u32 k = 0;
296 u32 hex_length;
297 u32 decimal_length;
298 u32 remainder;
299 u8 supress_zeros;
300
301 ACPI_FUNCTION_ENTRY();
302
303 switch (base) {
304 case 10:
305
306 /* Setup max length for the decimal number */
307
308 switch (data_width) {
309 case 1:
310 decimal_length = ACPI_MAX8_DECIMAL_DIGITS;
311 break;
312
313 case 4:
314 decimal_length = ACPI_MAX32_DECIMAL_DIGITS;
315 break;
316
317 case 8:
318 default:
319 decimal_length = ACPI_MAX64_DECIMAL_DIGITS;
320 break;
321 }
322
323 supress_zeros = TRUE; /* No leading zeros */
324 remainder = 0;
325
326 for (i = decimal_length; i > 0; i--) {
327
328 /* Divide by nth factor of 10 */
329
330 digit = integer;
331 for (j = 0; j < i; j++) {
332 (void)acpi_ut_short_divide(digit, 10, &digit,
333 &remainder);
334 }
335
336 /* Handle leading zeros */
337
338 if (remainder != 0) {
339 supress_zeros = FALSE;
340 }
341
342 if (!supress_zeros) {
343 string[k] = (u8) (ACPI_ASCII_ZERO + remainder);
344 k++;
345 }
346 }
347 break;
348
349 case 16:
350
351 /* hex_length: 2 ascii hex chars per data byte */
352
353 hex_length = ACPI_MUL_2(data_width);
354 for (i = 0, j = (hex_length - 1); i < hex_length; i++, j--) {
355
356 /* Get one hex digit, most significant digits first */
357
358 string[k] =
359 (u8) acpi_ut_hex_to_ascii_char(integer,
360 ACPI_MUL_4(j));
361 k++;
362 }
363 break;
364
365 default:
366 return (0);
367 }
368
369 /*
370 * Since leading zeros are suppressed, we must check for the case where
371 * the integer equals 0
372 *
373 * Finally, null terminate the string and return the length
374 */
375 if (!k) {
376 string[0] = ACPI_ASCII_ZERO;
377 k = 1;
378 }
379
380 string[k] = 0;
381 return ((u32) k);
382 }
383
384 /*******************************************************************************
385 *
386 * FUNCTION: acpi_ex_convert_to_string
387 *
388 * PARAMETERS: obj_desc - Object to be converted. Must be an
389 * Integer, Buffer, or String
390 * result_desc - Where the string object is returned
391 * Type - String flags (base and conversion type)
392 *
393 * RETURN: Status
394 *
395 * DESCRIPTION: Convert an ACPI Object to a string
396 *
397 ******************************************************************************/
398
399 acpi_status
acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,union acpi_operand_object ** result_desc,u32 type)400 acpi_ex_convert_to_string(union acpi_operand_object * obj_desc,
401 union acpi_operand_object ** result_desc, u32 type)
402 {
403 union acpi_operand_object *return_desc;
404 u8 *new_buf;
405 u32 i;
406 u32 string_length = 0;
407 u16 base = 16;
408 u8 separator = ',';
409
410 ACPI_FUNCTION_TRACE_PTR(ex_convert_to_string, obj_desc);
411
412 switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
413 case ACPI_TYPE_STRING:
414
415 /* No conversion necessary */
416
417 *result_desc = obj_desc;
418 return_ACPI_STATUS(AE_OK);
419
420 case ACPI_TYPE_INTEGER:
421
422 switch (type) {
423 case ACPI_EXPLICIT_CONVERT_DECIMAL:
424
425 /* Make room for maximum decimal number */
426
427 string_length = ACPI_MAX_DECIMAL_DIGITS;
428 base = 10;
429 break;
430
431 default:
432
433 /* Two hex string characters for each integer byte */
434
435 string_length = ACPI_MUL_2(acpi_gbl_integer_byte_width);
436 break;
437 }
438
439 /*
440 * Create a new String
441 * Need enough space for one ASCII integer (plus null terminator)
442 */
443 return_desc =
444 acpi_ut_create_string_object((acpi_size) string_length);
445 if (!return_desc) {
446 return_ACPI_STATUS(AE_NO_MEMORY);
447 }
448
449 new_buf = return_desc->buffer.pointer;
450
451 /* Convert integer to string */
452
453 string_length =
454 acpi_ex_convert_to_ascii(obj_desc->integer.value, base,
455 new_buf,
456 acpi_gbl_integer_byte_width);
457
458 /* Null terminate at the correct place */
459
460 return_desc->string.length = string_length;
461 new_buf[string_length] = 0;
462 break;
463
464 case ACPI_TYPE_BUFFER:
465
466 /* Setup string length, base, and separator */
467
468 switch (type) {
469 case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by to_decimal_string */
470 /*
471 * From ACPI: "If Data is a buffer, it is converted to a string of
472 * decimal values separated by commas."
473 */
474 base = 10;
475
476 /*
477 * Calculate the final string length. Individual string values
478 * are variable length (include separator for each)
479 */
480 for (i = 0; i < obj_desc->buffer.length; i++) {
481 if (obj_desc->buffer.pointer[i] >= 100) {
482 string_length += 4;
483 } else if (obj_desc->buffer.pointer[i] >= 10) {
484 string_length += 3;
485 } else {
486 string_length += 2;
487 }
488 }
489 break;
490
491 case ACPI_IMPLICIT_CONVERT_HEX:
492 /*
493 * From the ACPI spec:
494 *"The entire contents of the buffer are converted to a string of
495 * two-character hexadecimal numbers, each separated by a space."
496 */
497 separator = ' ';
498 string_length = (obj_desc->buffer.length * 3);
499 break;
500
501 case ACPI_EXPLICIT_CONVERT_HEX: /* Used by to_hex_string */
502 /*
503 * From ACPI: "If Data is a buffer, it is converted to a string of
504 * hexadecimal values separated by commas."
505 */
506 string_length = (obj_desc->buffer.length * 3);
507 break;
508
509 default:
510 return_ACPI_STATUS(AE_BAD_PARAMETER);
511 }
512
513 /*
514 * Create a new string object and string buffer
515 * (-1 because of extra separator included in string_length from above)
516 * Allow creation of zero-length strings from zero-length buffers.
517 */
518 if (string_length) {
519 string_length--;
520 }
521
522 return_desc = acpi_ut_create_string_object((acpi_size)
523 string_length);
524 if (!return_desc) {
525 return_ACPI_STATUS(AE_NO_MEMORY);
526 }
527
528 new_buf = return_desc->buffer.pointer;
529
530 /*
531 * Convert buffer bytes to hex or decimal values
532 * (separated by commas or spaces)
533 */
534 for (i = 0; i < obj_desc->buffer.length; i++) {
535 new_buf += acpi_ex_convert_to_ascii((acpi_integer)
536 obj_desc->buffer.
537 pointer[i], base,
538 new_buf, 1);
539 *new_buf++ = separator; /* each separated by a comma or space */
540 }
541
542 /*
543 * Null terminate the string
544 * (overwrites final comma/space from above)
545 */
546 if (obj_desc->buffer.length) {
547 new_buf--;
548 }
549 *new_buf = 0;
550 break;
551
552 default:
553 return_ACPI_STATUS(AE_TYPE);
554 }
555
556 *result_desc = return_desc;
557 return_ACPI_STATUS(AE_OK);
558 }
559
560 /*******************************************************************************
561 *
562 * FUNCTION: acpi_ex_convert_to_target_type
563 *
564 * PARAMETERS: destination_type - Current type of the destination
565 * source_desc - Source object to be converted.
566 * result_desc - Where the converted object is returned
567 * walk_state - Current method state
568 *
569 * RETURN: Status
570 *
571 * DESCRIPTION: Implements "implicit conversion" rules for storing an object.
572 *
573 ******************************************************************************/
574
575 acpi_status
acpi_ex_convert_to_target_type(acpi_object_type destination_type,union acpi_operand_object * source_desc,union acpi_operand_object ** result_desc,struct acpi_walk_state * walk_state)576 acpi_ex_convert_to_target_type(acpi_object_type destination_type,
577 union acpi_operand_object *source_desc,
578 union acpi_operand_object **result_desc,
579 struct acpi_walk_state *walk_state)
580 {
581 acpi_status status = AE_OK;
582
583 ACPI_FUNCTION_TRACE(ex_convert_to_target_type);
584
585 /* Default behavior */
586
587 *result_desc = source_desc;
588
589 /*
590 * If required by the target,
591 * perform implicit conversion on the source before we store it.
592 */
593 switch (GET_CURRENT_ARG_TYPE(walk_state->op_info->runtime_args)) {
594 case ARGI_SIMPLE_TARGET:
595 case ARGI_FIXED_TARGET:
596 case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */
597
598 switch (destination_type) {
599 case ACPI_TYPE_LOCAL_REGION_FIELD:
600 /*
601 * Named field can always handle conversions
602 */
603 break;
604
605 default:
606 /* No conversion allowed for these types */
607
608 if (destination_type !=
609 ACPI_GET_OBJECT_TYPE(source_desc)) {
610 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
611 "Explicit operator, will store (%s) over existing type (%s)\n",
612 acpi_ut_get_object_type_name
613 (source_desc),
614 acpi_ut_get_type_name
615 (destination_type)));
616 status = AE_TYPE;
617 }
618 }
619 break;
620
621 case ARGI_TARGETREF:
622
623 switch (destination_type) {
624 case ACPI_TYPE_INTEGER:
625 case ACPI_TYPE_BUFFER_FIELD:
626 case ACPI_TYPE_LOCAL_BANK_FIELD:
627 case ACPI_TYPE_LOCAL_INDEX_FIELD:
628 /*
629 * These types require an Integer operand. We can convert
630 * a Buffer or a String to an Integer if necessary.
631 */
632 status =
633 acpi_ex_convert_to_integer(source_desc, result_desc,
634 16);
635 break;
636
637 case ACPI_TYPE_STRING:
638 /*
639 * The operand must be a String. We can convert an
640 * Integer or Buffer if necessary
641 */
642 status =
643 acpi_ex_convert_to_string(source_desc, result_desc,
644 ACPI_IMPLICIT_CONVERT_HEX);
645 break;
646
647 case ACPI_TYPE_BUFFER:
648 /*
649 * The operand must be a Buffer. We can convert an
650 * Integer or String if necessary
651 */
652 status =
653 acpi_ex_convert_to_buffer(source_desc, result_desc);
654 break;
655
656 default:
657 ACPI_ERROR((AE_INFO,
658 "Bad destination type during conversion: %X",
659 destination_type));
660 status = AE_AML_INTERNAL;
661 break;
662 }
663 break;
664
665 case ARGI_REFERENCE:
666 /*
667 * create_xxxx_field cases - we are storing the field object into the name
668 */
669 break;
670
671 default:
672 ACPI_ERROR((AE_INFO,
673 "Unknown Target type ID 0x%X AmlOpcode %X DestType %s",
674 GET_CURRENT_ARG_TYPE(walk_state->op_info->
675 runtime_args),
676 walk_state->opcode,
677 acpi_ut_get_type_name(destination_type)));
678 status = AE_AML_INTERNAL;
679 }
680
681 /*
682 * Source-to-Target conversion semantics:
683 *
684 * If conversion to the target type cannot be performed, then simply
685 * overwrite the target with the new object and type.
686 */
687 if (status == AE_TYPE) {
688 status = AE_OK;
689 }
690
691 return_ACPI_STATUS(status);
692 }
693